Installation manual

24
Reference Manual
00809-0100-4075, Rev CA
Section 3: Mounting
March 2014
Mounting
Figure 3-18. THUM adapter only, powered by a 24 V power supply with 1200 Ohm resistor
to limit current to 20 mA
Figure 3-19. Wiring diagram for 2-wire device
Figure 3-20. Wiring diagram for 2-wire device with resistor
Note
A passive loop exists when the wired device is not supplying power to the 4-20 loop. It is
important to verify if the wired device is operating in active or passive mode.
Remote Mount
Housing
THUM Adapter
250 Ohm
Resistor
Ground
1200 Ohm
Resistor
Required
-
24 V
Power
Supply
+
Green
White
Black
Red
Yellow
Splice Connector
Wired Device
4-20 mA Loop -
4-20 mA Loop +
Ground
- PWR / COMM
+ PWR / COMM
THUM Adapter
Green
Red
Black
White
Yellow
Splice Connector
Wired Device
4-20 mA Loop -
4-20 mA Loop +
Ground
- PWR / COMM
+ PWR / COMM
THUM Adapter
Green
Red
Black
White
Yellow
Resistor